Luther and Calvin, Knox and Latimer did not think: We have so much in common with the Romanists, we need to make common cause with them in opposing humanism and Islam. The Reformers did not say: We can be co-belligerents with Rome, since we agree on God, Jesus Christ, abortion, and so many other things. Rather than splitting the Church, let us make a united front against the Turk.

No, rather than being deceived by the popular sort of worldview thinking which says that one can have a Christian worldview without the Christian Gospel, the Reformers, like the Apostle Paul, made soteriology the centerpiece of Christianity. (Online source)